CN114750612A - High-voltage pre-charging method and device for battery pack in electric automobile, storage medium and vehicle - Google Patents
High-voltage pre-charging method and device for battery pack in electric automobile, storage medium and vehicle Download PDFInfo
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- CN114750612A CN114750612A CN202011565607.6A CN202011565607A CN114750612A CN 114750612 A CN114750612 A CN 114750612A CN 202011565607 A CN202011565607 A CN 202011565607A CN 114750612 A CN114750612 A CN 114750612A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
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- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses a high-voltage pre-charging method and device for a battery pack in an electric automobile, a storage medium and a vehicle, wherein the method comprises the following steps of controlling the conduction of a pre-charging loop of the battery pack after receiving a high-voltage power-on command of the electric automobile so as to pre-charge a bus capacitor by the battery pack through the pre-charging loop; acquiring the voltage, the bus voltage and the bus current of a battery pack in the pre-charging process, and the pre-charging duration; and judging whether the pre-charging of the bus capacitor is successfully completed or not according to the voltage of the battery pack, the bus voltage, the bus current and the pre-charging duration. Therefore, in the process of high-voltage pre-charging of the battery pack in the electric automobile, whether the pre-charging of the bus capacitor is successfully completed or not is judged by combining the bus current, so that the condition that the bus capacitor misjudges the success of the high-voltage pre-charging of the battery pack due to poor contact is avoided, the safety of the high-voltage pre-charging of the battery pack is ensured, and the stability of the battery pack is improved.
Description
Technical Field
The invention relates to the technical field of electric automobiles, in particular to a high-voltage pre-charging method for a battery pack in an electric automobile, a computer readable storage medium, a high-voltage pre-charging device for the battery pack in the electric automobile and a vehicle.
Background
Currently, the high voltage pre-charging strategy of the electric vehicle is to consider the pre-charging success when a BMS (battery management system) detects that a bus voltage reaches 95% of a battery pack voltage, close a positive contactor, and then open a pre-charging contactor.
However, when the high-voltage copper plate of the bus capacitor is in poor contact, after the main negative contactor and the pre-charging contactor are closed, the bus capacitor is broken due to poor contact, the voltage at two ends of the bus capacitor is equal to the voltage of the battery pack, at the moment, the BMS can directly judge that pre-charging is completed, the positive contactor is closed, and the pre-charging contactor is opened.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, an object of the present invention is to provide a high-voltage pre-charging method for a battery pack in an electric vehicle, which can determine whether to successfully complete pre-charging of a bus capacitor in combination with a bus current in a high-voltage pre-charging process of the battery pack in the electric vehicle, so as to avoid misjudgment of successful high-voltage pre-charging of the battery pack due to poor contact of the bus capacitor, thereby ensuring safety of high-voltage pre-charging of the battery pack and improving stability of the battery pack.
A second object of the invention is to propose a computer-readable storage medium.
The third purpose of the invention is to provide a high-voltage pre-charging device of a battery pack in an electric automobile.
A fourth object of the invention is to propose a vehicle.
In order to achieve the above object, a method for precharging a battery pack in an electric vehicle according to an embodiment of a first aspect of the present invention includes the following steps: after a high-voltage power-on command of the electric automobile is received, controlling a pre-charging loop of a battery pack to be conducted so that the battery pack pre-charges a bus capacitor through the pre-charging loop; acquiring the voltage, the bus voltage and the bus current of the battery pack in the pre-charging process, and the pre-charging duration; and judging whether the pre-charging of the bus capacitor is successfully completed or not according to the voltage of the battery pack, the bus voltage, the bus current and the pre-charging duration.
According to the high-voltage pre-charging method for the battery pack in the electric automobile, after a high-voltage power-on command of the electric automobile is received, the pre-charging loop of the battery pack is controlled to be conducted, so that the battery pack pre-charges a bus capacitor through the pre-charging loop, the voltage, the bus current and the pre-charging duration of the battery pack in the pre-charging process are obtained, and further whether the pre-charging of the bus capacitor is successfully completed is judged according to the voltage, the bus current and the pre-charging duration of the battery pack. Therefore, in the process of high-voltage pre-charging of the battery pack in the electric automobile, whether the pre-charging of the bus capacitor is successfully completed or not is judged by combining the bus current, so that the condition that the bus capacitor misjudges the success of the high-voltage pre-charging of the battery pack due to poor contact is avoided, the safety of the high-voltage pre-charging of the battery pack is ensured, and the stability of the battery pack is improved.
In addition, the method for precharging the battery pack in the electric vehicle according to the embodiment of the invention may further have the following additional technical features:
according to an embodiment of the present invention, the determining whether the pre-charging of the bus capacitor is successfully completed according to the voltage of the battery pack, the bus voltage, the bus current, and the pre-charging duration includes: and if the bus voltage is greater than or equal to the product of the voltage of the battery pack and a first preset value, the maximum value of the bus current in the pre-charging process is greater than or equal to a first preset current, and the pre-charging time is less than or equal to a first preset time, successfully completing the pre-charging of the bus capacitor, wherein the first preset value is less than 1.
According to an embodiment of the present invention, the determining whether the pre-charging of the bus capacitor is successfully completed according to the voltage of the battery pack, the bus voltage, the bus current, and the pre-charging duration further includes: and if the pre-charging duration is greater than a first preset duration, determining that the pre-charging of the bus capacitor is not completed successfully.
According to an embodiment of the present invention, after determining that the precharge of the bus capacitor is successfully completed, the method further includes: and firstly, controlling the high-voltage power supply loop of the battery pack to be switched on, and then controlling the pre-charging loop to be switched off so as to enable the battery pack to supply power to a load and stop pre-charging the bus capacitor.
According to an embodiment of the present invention, after determining that the precharging of the bus capacitor is not successfully completed, the method further includes: and controlling the pre-charging loop to be disconnected and stopping high-voltage power-on.
According to an embodiment of the present invention, before controlling the pre-charge loop of the battery pack to be conductive, the method further includes: judging whether the battery pack is in a state of forbidding high-voltage power-on; and if the battery pack is in the high-voltage electrifying forbidding state, forbidding to control the conduction of the pre-charging loop.
According to one embodiment of the invention, the high voltage power-on prohibition state comprises one or more of a battery pack overvoltage protection state, a battery pack over-temperature protection state, a battery pack self fault state, a battery pack voltage detection fault state, a bus voltage detection fault state and a bus current detection fault state.
In order to achieve the above object, a computer-readable storage medium is provided in an embodiment of a second aspect of the present invention, on which a high-voltage pre-charging program of a battery pack in an electric vehicle is stored, and when the program is executed by an actuator, the high-voltage pre-charging method of the battery pack in the electric vehicle can be implemented.
According to the computer-readable storage medium of the embodiment of the invention, the executor executes the high-voltage pre-charging program of the battery pack in the electric vehicle, which is stored in the computer-readable storage medium, so that whether the pre-charging of the bus capacitor is successfully completed or not can be judged by combining the bus current in the high-voltage pre-charging process of the battery pack in the electric vehicle, and the condition that the high-voltage pre-charging of the battery pack is successfully judged by mistake due to poor contact of the bus capacitor is avoided, therefore, the safety of the high-voltage pre-charging of the battery pack is ensured, and the stability of the battery pack is improved.
In order to achieve the above object, according to a third aspect of the present invention, there is provided a high-voltage pre-charging apparatus for a battery pack in an electric vehicle, wherein the battery pack includes a negative contactor and a pre-charging contactor, the apparatus including: the BMS module is used for acquiring a high-voltage power-on instruction; the control module is used for controlling the negative contactor and the pre-charging contactor to be closed according to the high-voltage electrifying instruction; the voltage and current acquisition module is used for acquiring the voltage of a battery pack loop bus, the current of the battery pack loop bus and the voltage of a battery pack; and the judging module is used for judging whether the battery pack completes high-voltage pre-charging according to the bus voltage, the bus current and the battery pack voltage.
According to the high-voltage pre-charging device for the battery pack in the electric automobile, the BMS module is used for acquiring a high-voltage power-on command, the control module is used for controlling the negative contactor and the pre-charging contactor to be closed according to the high-voltage power-on command, the voltage and current acquisition module is used for acquiring the bus voltage of the battery pack loop, the bus current of the battery pack loop and the voltage of the battery pack, and the judgment module is used for judging whether the battery pack completes high-voltage pre-charging according to the bus voltage, the bus current and the voltage of the battery pack. Therefore, in the process of high-voltage pre-charging of the battery pack in the electric automobile, whether the pre-charging of the bus capacitor is successfully completed or not is judged by combining the bus current, so that the condition that the bus capacitor misjudges the success of the high-voltage pre-charging of the battery pack due to poor contact is avoided, the safety of the high-voltage pre-charging of the battery pack is ensured, and the stability of the battery pack is improved.
In order to achieve the above object, a vehicle according to a fourth aspect of the present invention includes a high-voltage pre-charging device for a battery pack in an electric vehicle as described above.
According to the vehicle provided by the embodiment of the invention, the high-voltage pre-charging device for the battery pack in the electric vehicle is adopted, so that whether the pre-charging of the bus capacitor is successfully completed or not can be judged by combining the bus current in the high-voltage pre-charging process of the battery pack in the electric vehicle, the condition that the bus capacitor misjudges the success of the high-voltage pre-charging of the battery pack due to poor contact can be avoided, the safety of the high-voltage pre-charging of the battery pack can be ensured, and the stability of the battery pack can be improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic flow chart of a high-voltage pre-charging method for a battery pack in an electric vehicle according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a high-voltage pre-charging method for a battery pack in an electric vehicle according to an embodiment of the invention;
fig. 3 is a schematic flow chart of a method for high-voltage pre-charging a battery pack in an electric vehicle according to an embodiment of the invention after pre-charging;
fig. 4 is a schematic flow chart of a high-voltage pre-charging method for a battery pack in an electric vehicle according to an embodiment of the invention before pre-charging;
FIG. 5 is a flow chart illustrating a method for pre-charging a battery pack of an electric vehicle according to an embodiment of the present invention;
FIG. 6 is a block diagram of a high voltage pre-charge device of a battery pack in an electric vehicle according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a voltage-current sampling architecture of a high-voltage pre-charging device of a battery pack in an electric vehicle according to an embodiment of the invention;
FIG. 8 is a block schematic diagram of a vehicle according to an embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A high-voltage precharging method of a battery pack in an electric vehicle, a computer-readable storage medium, a high-voltage precharging apparatus of a battery pack in an electric vehicle, and a vehicle according to embodiments of the present invention will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic flow chart illustrating a high-voltage pre-charging method for a battery pack in an electric vehicle according to an embodiment of the present invention.
As shown in fig. 1, the high-voltage pre-charging method for a battery pack in an electric vehicle includes the following steps:
and S1, after receiving the high-voltage electrifying command of the electric automobile, controlling the pre-charging loop of the battery pack to be conducted so that the battery pack pre-charges the bus capacitor through the pre-charging loop.
That is, after a BMS (battery manager) of the electric vehicle receives a high voltage power-on command of the electric vehicle, the pre-charge circuit of the battery pack may be controlled to be turned on, so that the battery pack pre-charges the bus capacitor through the pre-charge circuit.
And S2, acquiring the voltage, the bus voltage and the bus current of the battery pack in the pre-charging process and the pre-charging time length.
Optionally, in the process of precharging the bus capacitor, the bus current can be acquired through a current sensor signal, the voltage of the battery pack can be acquired through a battery pack voltage sampling signal, the bus voltage can be acquired through a bus voltage sampling signal, and meanwhile, when the precharge circuit of the battery pack is controlled to be switched on, the precharge duration begins to be recorded.
And S3, judging whether the pre-charging of the bus capacitor is successfully completed according to the voltage of the battery pack, the bus voltage, the bus current and the pre-charging time length.
That is to say, can be according to the voltage of the battery package in the precharge process, bus voltage and bus current to and precharge duration, judge whether successfully accomplish the precharge to the bus capacitance to according to the precharge result of bus capacitance, carry out corresponding control to the precharge return circuit of battery package, thereby, guarantee the security of battery package high pressure precharge, improve the stability of battery package.
Specifically, as shown in fig. 2, determining whether to successfully complete the pre-charging of the bus capacitor according to the voltage of the battery pack, the bus voltage, the bus current and the pre-charging time period includes:
s101, if the bus voltage is greater than or equal to the product of the voltage of the battery pack and a first preset value, the maximum value of the bus current in the pre-charging process is greater than or equal to a first preset current, and the pre-charging duration is less than or equal to the first preset duration, it is determined that the pre-charging of the bus capacitor is successfully completed, wherein the first preset value is less than 1.
Optionally, the first preset value, the first preset current and the first preset time may be set according to a charging parameter for successfully completing the precharging of the bus capacitor, for example, in an embodiment of the present invention, the first preset value may be preferably 0.95, the first preset current may be preferably 1A, and the first preset time may be preferably 300ms, for example, when the bus voltage is greater than or equal to 0.95 of the voltage of the battery pack, the maximum value of the bus current in the precharging process is greater than or equal to 1A, and the precharging time is less than or equal to 300ms, it may be determined that the precharging of the bus capacitor is successfully completed.
Further, as shown in fig. 2, determining whether to successfully complete the pre-charging of the bus capacitor according to the voltage of the battery pack, the bus voltage, the bus current, and the pre-charging duration further includes:
s102, if the precharging time length is larger than the first preset time length, the bus capacitor is judged to be unsuccessfully precharged.
For example, if the precharge duration is greater than 300ms, the duration of precharging the bus capacitor may be considered to exceed the normal precharge duration, and at this time, it may be determined that the precharging of the bus capacitor is not successfully completed.
Therefore, according to the high-voltage pre-charging method for the battery pack in the electric automobile, whether the pre-charging of the bus capacitor is successfully completed or not can be judged according to the voltage of the battery pack, the bus voltage and the bus current in the pre-charging process and the pre-charging duration, so that the pre-charging loop of the battery pack is correspondingly controlled according to the pre-charging result of the bus capacitor, the safety of the high-voltage pre-charging of the battery pack is ensured, and the stability of the battery pack is improved.
Specifically, as shown in fig. 3, after determining that the precharging of the bus capacitor is successfully completed, the method further includes:
s201, firstly controlling the high-voltage power supply loop of the battery pack to be conducted, and then controlling the pre-charging loop to be disconnected so that the battery pack supplies power to the load, and stopping pre-charging the bus capacitor.
It should be understood that after the pre-charging of the bus capacitor is successfully completed, the positive contactor may be closed, so as to control the high-voltage power supply circuit of the battery pack to be conducted, so that the battery pack supplies power to the load, and then the pre-charging contactor is opened, so as to control the pre-charging circuit to be disconnected, and stop the pre-charging of the bus capacitor, thereby implementing the high-voltage power-on of the electric vehicle.
Further, as shown in fig. 3, after determining that the precharging of the bus capacitor is not successfully completed, the method further includes:
and S202, controlling the pre-charging loop to be disconnected and stopping high-voltage power-on.
It should be appreciated that after determining that the pre-charging of the bus capacitor is not successfully completed, the pre-charging contactor may be opened, the pre-charging circuit may be controlled to be opened, the pre-charging of the bus capacitor may be stopped, and the high voltage power-up may be stopped, thereby preventing the electric vehicle from still performing the high voltage power-up when the pre-charging of the bus capacitor is not successfully completed.
Therefore, according to the high-voltage pre-charging method for the battery pack in the electric automobile, after the pre-charging of the bus capacitor is successfully finished according to the pre-charging result of the bus capacitor, the high-voltage power supply loop of the battery pack is controlled to be on, then the pre-charging loop is controlled to be off, so that the battery pack supplies power to the load and stops pre-charging of the bus capacitor, and after the pre-charging of the bus capacitor is not successfully finished, the pre-charging loop is controlled to be off and stops high-voltage power-on, so that the high-voltage pre-charging safety of the battery pack is ensured, and the stability of the battery pack is improved.
Further, as shown in fig. 4, before the pre-charging loop of the battery pack is controlled to be turned on, the method further includes:
and S301, judging whether the battery pack is in a high-voltage electrifying forbidding state.
Optionally, the high-voltage power-on prohibition state includes one or more of a battery pack overvoltage protection state, a battery pack over-temperature protection state, a battery pack self fault state, a battery pack voltage detection fault state, a bus voltage detection fault state, and a bus current detection fault state.
And S302, if the battery pack is in a state of prohibiting high-voltage power-on, prohibiting the control of the pre-charging loop to be conducted. That is to say, when the battery pack is in one or more of a battery pack overvoltage protection state, a battery pack over-temperature protection state, a battery pack self fault state, a battery pack voltage detection fault state, a bus voltage detection fault state and a bus current detection fault state, the conduction of the pre-charging loop is forbidden to be controlled, so that the phenomenon that other safety accidents are caused by pre-charging of a bus capacitor when the battery pack is in a high-voltage electrifying forbidden state is avoided.
Optionally, if the battery pack is in the high-voltage power-up prohibition state, a high-voltage power-up prohibition prompt message may be sent to the user, so that the user can check and clarify the fault state of the battery pack in time, and the battery pack is moved out of the high-voltage power-up prohibition state.
Referring to fig. 5 and the embodiment of the present invention, a method for precharging a battery pack in an electric vehicle at a high voltage is described, and as shown in fig. 5, after the electric vehicle is powered on and started, step S10 is executed.
S10, judging whether the BMS receives the high-voltage power-on command, if yes, executing the step S20; if not, return is made to step S10.
S20, judging whether the battery pack is in the state of prohibiting high-voltage power-on, if so, executing the step S20; if not, step S30 is performed.
It should be understood that if the battery pack is in the high-voltage power-up prohibition state, the battery pack state needs to be determined again until the battery pack exits from the high-voltage power-up prohibition state.
S30, the BMS closes the negative contactor and the pre-charge contactor.
S40, judging whether the bus voltage is larger than or equal to the product of the voltage of the battery pack and a first preset value (0.95), and whether the maximum value of the bus current in the pre-charging process is larger than or equal to a first preset current (1A), if so, executing the step S50; if not, step S51 is performed.
S50, determining whether the pre-charge time is less than or equal to the first preset time (300ms), if yes, executing step S70; if not, step S60 is performed.
S51, judging whether the pre-charging time length is less than or equal to a first preset time length (300ms), if yes, executing the step S40; if not, step S60 is performed.
And S60, judging that the bus capacitor is not successfully precharged, disconnecting the precharge contactor and stopping high-voltage electrification.
And S70, judging that the pre-charging of the bus capacitor is successfully completed, and closing the anode contactor.
In summary, according to the high-voltage pre-charging method for the battery pack in the electric vehicle in the embodiment of the present invention, after the high-voltage power-on command of the electric vehicle is received, the pre-charging loop of the battery pack is controlled to be turned on, so that the battery pack pre-charges the bus capacitor through the pre-charging loop, and the voltage, the bus current, and the pre-charging duration of the battery pack during the pre-charging process are obtained, and further, whether the pre-charging of the bus capacitor is successfully completed is determined according to the voltage, the bus current, and the pre-charging duration of the battery pack. Therefore, in the process of high-voltage pre-charging of the battery pack in the electric automobile, whether the pre-charging of the bus capacitor is successfully completed or not is judged by combining the bus current, so that the condition that the bus capacitor misjudges the success of the high-voltage pre-charging of the battery pack due to poor contact is avoided, the safety of the high-voltage pre-charging of the battery pack is ensured, and the stability of the battery pack is improved.
Further, the present invention also provides a computer-readable storage medium, on which a high-voltage pre-charging program of a battery pack in an electric vehicle is stored, which, when executed by an actuator, performs the high-voltage pre-charging method of the battery pack in the electric vehicle according to the above-described embodiment of the present invention.
It is understood that the foregoing high-voltage pre-charging method for battery packs in an electric vehicle according to an embodiment of the present invention may be written as a computer program stored in a computer readable storage medium, and the high-voltage pre-charging program for battery packs in the electric vehicle may be executed by an actuator to implement a specific implementation corresponding to the foregoing high-voltage pre-charging method for battery packs in an electric vehicle according to an embodiment of the present invention.
In summary, according to the computer-readable storage medium of the embodiment of the invention, the actuator executes the high-voltage pre-charging program of the battery pack in the electric vehicle, which is stored in the computer-readable storage medium, so that it can be determined whether the pre-charging of the bus capacitor is successfully completed by combining the bus current in the process of performing the high-voltage pre-charging on the battery pack in the electric vehicle, so as to avoid that the bus capacitor erroneously determines that the high-voltage pre-charging of the battery pack is successfully completed due to poor contact, thereby ensuring the safety of the high-voltage pre-charging of the battery pack and improving the stability of the battery pack.
Fig. 6 is a block diagram illustrating a high-voltage pre-charging device of a battery pack in an electric vehicle according to an embodiment of the present invention.
As shown in fig. 6, the high voltage pre-charging apparatus 100 for a battery pack in an electric vehicle includes a BMS module 10, a control module 20, a voltage current obtaining module 30, and a judging module 40.
The BMS module 10 is used for acquiring a high-voltage power-on instruction; the control module 20 is used for controlling the negative contactor and the pre-charging contactor to be closed according to the high-voltage electrifying instruction; the voltage and current acquisition module 30 is used for acquiring the voltage of the battery pack loop bus, the current of the battery pack loop bus and the voltage of the battery pack; the judging module 40 is configured to judge whether the battery pack completes high-voltage pre-charging according to the bus voltage, the bus current, and the battery pack voltage.
Preferably, as shown in fig. 7, the voltage and current acquisition module 30 may include a current acquisition filter circuit and a current sensor connected to each other, and a voltage acquisition filter circuit. The current sensor is used for detecting bus current, generating a current sensor signal according to the bus current and transmitting the current sensor signal to the current collection filter circuit, the current collection filter circuit filters the current sensor signal to generate a bus current signal and transmits the bus current signal to the BMS module 10, the voltage collection filter circuit is used for detecting battery pack voltage and bus voltage, acquiring a battery pack voltage sampling signal and a bus voltage sampling signal, and generating a battery pack voltage signal and transmitting the bus voltage signal to the BMS module 10 after filtering. The current collection filter circuit and the voltage collection filter circuit are respectively connected with the BMS module 10 and are used for transmitting bus current signals, battery pack voltage signals and bus voltage signals acquired by the current collection filter circuit and the voltage collection filter circuit to the BMS module 10.
It should be noted that, the specific implementation of the high-voltage pre-charging device for a battery pack in an electric vehicle according to the embodiment of the present invention corresponds to the specific implementation of the high-voltage pre-charging method for a battery pack in an electric vehicle according to the foregoing embodiment of the present invention, and details are not repeated herein.
In summary, according to the high-voltage pre-charging device for the battery pack in the electric vehicle in the embodiment of the invention, the BMS module acquires the high-voltage power-on command, and the control module controls the negative contactor and the pre-charging contactor to be closed according to the high-voltage power-on command, so that the voltage and current acquisition module acquires the bus voltage of the battery pack loop, the bus current of the battery pack loop and the voltage of the battery pack, and the judgment module judges whether the battery pack completes the high-voltage pre-charging according to the bus voltage, the bus current and the voltage of the battery pack. Therefore, in the process of high-voltage pre-charging of the battery pack in the electric automobile, whether the pre-charging of the bus capacitor is successfully completed or not is judged by combining the bus current, so that the condition that the bus capacitor misjudges the success of the high-voltage pre-charging of the battery pack due to poor contact is avoided, the safety of the high-voltage pre-charging of the battery pack is ensured, and the stability of the battery pack is improved.
FIG. 8 is a block schematic diagram of a vehicle according to an embodiment of the invention.
As shown in fig. 8, a vehicle 1000 includes a high voltage pre-charging device 100 for a battery pack in an electric vehicle according to the embodiment of the present invention.
Specifically, the vehicle 1000 may obtain a high voltage power-on command through the BMS module of the high voltage pre-charging device 100 of the battery pack in the electric vehicle, and control the negative contactor and the pre-charging contactor to be closed according to the high voltage power-on command through the control module 20 of the high voltage pre-charging device 100 of the battery pack in the electric vehicle, and further, obtain a bus voltage of the battery pack circuit, a bus current of the battery pack circuit, and a battery pack voltage through the voltage current obtaining module of the high voltage pre-charging device 100 of the battery pack in the electric vehicle, and determine whether the battery pack completes the high voltage pre-charging according to the bus voltage, the bus current, and the battery pack voltage through the determination module of the high voltage pre-charging device 100 of the battery pack in the electric vehicle, so as to perform corresponding control on the pre-charging circuit of the battery pack according to the pre-charging result of the bus capacitor, thereby ensuring the safety of the high voltage pre-charging of the battery pack, the stability of the battery pack is improved.
In summary, according to the vehicle in the embodiment of the invention, by using the high-voltage pre-charging device for the battery pack in the electric vehicle, whether the pre-charging of the bus capacitor is successfully completed can be determined by combining the bus current in the high-voltage pre-charging process of the battery pack in the electric vehicle, so as to avoid that the bus capacitor erroneously determines that the high-voltage pre-charging of the battery pack is successful due to poor contact, thereby ensuring the safety of the high-voltage pre-charging of the battery pack and improving the stability of the battery pack.
It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, such as an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Further, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following technologies, which are well known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A high-voltage pre-charging method for a battery pack in an electric automobile is characterized by comprising the following steps:
after a high-voltage power-on command of the electric automobile is received, controlling a pre-charging loop of a battery pack to be conducted so that the battery pack pre-charges a bus capacitor through the pre-charging loop;
acquiring the voltage, the bus voltage and the bus current of the battery pack in the pre-charging process, and the pre-charging duration;
and judging whether the pre-charging of the bus capacitor is successfully completed or not according to the voltage of the battery pack, the bus voltage, the bus current and the pre-charging duration.
2. The method for high-voltage pre-charging of a battery pack in an electric vehicle according to claim 1, wherein the determining whether the pre-charging of the bus capacitor is successfully completed according to the voltage of the battery pack, the bus voltage, the bus current and the pre-charging duration comprises:
and if the bus voltage is greater than or equal to the product of the voltage of the battery pack and a first preset value, the maximum value of the bus current in the pre-charging process is greater than or equal to a first preset current, and the pre-charging time is less than or equal to a first preset time, successfully completing the pre-charging of the bus capacitor, wherein the first preset value is less than 1.
3. The method for high-voltage pre-charging of battery pack in electric vehicle according to claim 2, wherein said determining whether the pre-charging of the bus capacitor is successfully completed according to the voltage of the battery pack, the bus voltage, the bus current and the pre-charging duration, further comprises:
and if the pre-charging duration is greater than a first preset duration, determining that the pre-charging of the bus capacitor is not completed successfully.
4. The method for high-voltage pre-charging of a battery pack in an electric vehicle according to claim 2, further comprising, after determining that the pre-charging of the bus capacitor is successfully completed:
and firstly, controlling the high-voltage power supply loop of the battery pack to be switched on, and then controlling the pre-charging loop to be switched off so as to enable the battery pack to supply power to a load and stop pre-charging the bus capacitor.
5. The method for high-voltage pre-charging of a battery pack in an electric vehicle according to claim 3, further comprising, after determining that the pre-charging of the bus capacitor is not successfully completed:
and controlling the pre-charging loop to be disconnected and stopping high-voltage power-on.
6. The high voltage pre-charging method for the battery pack in the electric vehicle according to any one of claims 1 to 5, further comprising, before controlling the pre-charging loop of the battery pack to be conductive:
judging whether the battery pack is in a state of forbidding high-voltage power-on;
and if the battery pack is in the high-voltage electrifying forbidding state, forbidding to control the pre-charging loop to be conducted.
7. The method of claim 6, wherein the high voltage power-up inhibiting state comprises one or more of a battery pack over-voltage protection state, a battery pack over-temperature protection state, a battery pack self fault state, a battery pack voltage detection fault state, a bus voltage detection fault state, and a bus current detection fault state.
8. A computer-readable storage medium, having stored thereon a high-voltage pre-charging program of a battery pack in an electric vehicle, which when executed by an actuator, performs the high-voltage pre-charging method of the battery pack in the electric vehicle according to any one of claims 1 to 7.
9. The utility model provides a high-pressure pre-charge device of battery package among electric automobile which characterized in that, the battery package includes negative pole contactor and pre-charge contactor, the device includes:
the BMS module is used for acquiring a high-voltage power-on instruction;
the control module is used for controlling the negative electrode contactor and the pre-charging contactor to be closed according to the high-voltage power-on command;
the voltage and current acquisition module is used for acquiring the voltage of a battery pack loop bus, the current of the battery pack loop bus and the voltage of a battery pack;
and the judging module is used for judging whether the battery pack completes high-voltage pre-charging according to the bus voltage, the bus current and the battery pack voltage.
10. A vehicle characterized by comprising the high-voltage precharge device of the battery pack in the electric vehicle according to claim 9.
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| CN116135573A (en) * | 2023-03-22 | 2023-05-19 | 小米汽车科技有限公司 | Pre-charging method, device, vehicle, storage medium and chip |
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